Arnold revealed he spotted Boyle while visiting his Scottish club Hibernian to see Mark Milligan and Jamie Maclaren.

"We look all over the world for players. When I went to Hibs to see Mark and Jamie I spent a day there watching him train," Arnold said.

"It was a no-brainer, (to see) if I could convince him to play for Australia. To be honest I didn't have to work too hard to convince him, he was very keen to do it.

"He's fit into the group so well. He's a fantastic kid and it was a pretty special night last night when we presented him with his debut jersey, and he got it from Timmy. I just said to him, you may have to be number four now."

Anyone who was against the @Socceroos going out and getting Martin Boyle can go and swim with the Loch Ness monster. 🇦🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿⚽️

Boyle was one of seven changes Arnold made to the side that started Saturday's game.

Sydney FC right back Grant became the 600th capped Socceroo when awarded his debut and Degenek was brought into the centre of defence.

Mustafa Amini and Jackson Irvine were called into the midfield and Boyle, Juric and Awer Mabil provided a new a strike force.

Jimmy Jeggo made his Socceroos debut off the bench late in the game.

Cahill won his 108th and final cap, coming on in the 82nd minute to the delight of many of the 33,268 patrons.

He was handed the captain's armband a few minutes later when leader for the night, Trent Sainsbury, was substituted.

Cahill couldn't score a 51st international goal, though on one occasion an inviting cross looked destined to find his head, before Lebanon defender Kassem Al Zein spoiled the moment by getting a glancing touch which flicked the ball away from the Socceroos veteran.

"I thought he misjudged it and I thought this is going to be a nice little tap in to the bottom left corner," Cahill said.

Australia dominated against a side ranked 82nd, 40 places below them in the world rankings.

"There's a lot of positives out of that but there's still so much more improvement," Arnold said. "There's a lot more to come, the movement is getting there."